Interfitting blocks for road paving



Fb. 2s, 192s. 1,660,459

J. G. THQMsoN INTERFITTING BLOCKS FOR ROAD PAVING Filed Feb 12. 1926 .HQI F. F

I la A/ F/'G.8. FIG 9 A B A A A y A A QVC A F/GZ B A A A A -A A A A A A, F/a/o A, r 1- Awl* 1 M INVENTOR:

33AM Graan17%omson Patented Feb. 28, 1928. i' i narran' srArEs 111AiraNTl ori-lcs y JOHN GRAHAM THOMSON, OF. ED[1\T]3T.TRGl-],l SCOTLAND. y

INTERFITTING BLOCKS FOB, ROAD'PAVING,

application rues February 1'2, 1926, serial No. smvfaand'a ereat'mnain Apri; s, 1925;

liiy invention consists in the making of au improved form of interiitting concrete block may be squared and thickenedso that its opposing sides are, for a predetermined depth, parallel to each other, and a recess,

or recesses, may be formed in the base to receive a tool, or tools, whereby the lifting and uithdrawal of the block, when required, is facilitated. The pyramidal block, with its thickened base, is hereinafter termed a pyramid, and the tetrahedral block a tetrad. The blocks are preferably made of concrete and may be reinforced.

In order that my said invention and the manner of performing` the same may be properly understood l hereunto append .a sheet of explanatory7 drawings to be hereinafter referred to in describing my invention.

Figures 1,and 2, are respectively a side elevation, and a plan of a pyramid. Figures 3, and 4, are similar views of a tetrad, and Figures 5, and 6, are similar views of a pyramid with a squared and thickened base. Figure 7, is a adjoining pyramids. Figure 8, is a plan of adjoining tetrads and pyramids, but Withure 9, is a similar view but With the inverted pyramid in position. Figure 10, is a plan of a part of a `road laid With the improved blocks, and Figure 1l, is a sectional elevation on the dotted line XI-XI, Figure 10. In'these drawings the same reference letters are used to mark the same or like parts Wherever they are repeated.

As shown in the dravvingsl the blocks, which are preferably made of concrete and may, if desired be reinforced, are of tvvo distinct forms, one of them ,is made in the form of a. four-sided or square-based pyramid A, Whose sides are equilateral triangles Whilst the other block is made in the forni of a tetrahedral, or triangular-based pyraside elevation of a tetrad and tWor out the central inverted pyramid,.and Figmid B, whose sides and base are equilateral` depth, parallel to each other as shown in o Figure 5. surface of the blocks to receive a tool (not shown) whereby the lifting and Withdrawal of the blocks, when desired, is facilitated. The pyramidal block A, is hereinafter termed a pyramid, and the tetrahedral block B, a tetrad. A y

Vith the object-of avoiding confusion the pyramid A, When-inverted is distinguished by the reference letter A1. j

The method of laying a road, street and the like with the improved blocks is, for example, as follows z-Place four `pyramids A, close together, as shown in Figures 7, 8, and 9, thus covering a comparatively large square area, lay four tetrads B, inthe spaces between the pyramids A, Which gives the formation shown in Figure 8, and into the space or pit thus formed insert an inverted pyramidA?, as shown in Figure 9. These five pyramids and four tetrads, thus positioned, form one complete unit of the paving. The finished surfacev will shovva numberv of squares, being the bases of the in- Recesses C, are formed in the verted pyramids A1, which may in turn be l V divided into smaller squares to give foot-v hold for horses.

While the blocks may be laid in the manner just described, other methods of doing so may be adopted, and the angles on one orV more sides of the pyramid may be modified so as to give-instead of the angle shown, any angle Which may be found most suitable in practice,and thereby suit the angle or curve or like material Well Waterproofed.Y

l/Vhen vertical pressure is applied to the base of an inverted pyramid, that pressure will be transmitted by the inclined faces of l. A pavement comprising blocks in thev form of pyramids and tetrahedrons, the arrangement of said blocks being such that thev pavement surface consista of tho"bams of` inverted pyramids, with pyramids and' tetrahvedrons adjoining and supportm thofun-A A2. A paving' structure comprising a `plurality of blocks of pyramiidlfoifmdisposed! with their bases in abutting relation, blocks of tetrrhedial formdisposed `between tho Stdsofzadjaoentfpyramids thereby to forni( Aopenimgsoi inverted pyiamidal foi'iu be* 10 i tween-"said blocks, and blocks of pyrzunidal Vform.,disposodtininverted. position in said JOHN GrRAHAMY THOMSON. 

